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Disorder and compositional dependences in Urbach-Martienssen tails in amorphous (GeTe)x(Sb2Te3)1-x alloys
1V.E. Lashkaryov Institute of Semiconductor Physics of NAS of Ukraine, Kyiv, Ukraine. k.shportko@ukr.net.
Abstract:
This work focuses on the compositional dependences in parameters that govern the optical properties of (GeTe)x(Sb2Te3)1-x amorphous alloys in the wide spectral range from above the phonons and to the inter-band electronic transitions. We studied the absorption edge fluctuations that are linked to the variations of the bandgap Eg, the width of Urbach-Martienssen tails EU, the Tauc parameter B1/2, and average halfwidth
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